Cell Classification And Its Effect On The Human Body Essay

While water is commonly referred to as the â€Å"elixir of life† because of its universal qualities, cells are credited as being responsible for making the human organism â€Å"alive†. It is the difference between a cluster of organic atoms or molecules that can react chemically, and a single living cell, the smallest unit of life. The study of cells is called cytology, and any research usually requires the use of a high-definition microscope, as most cells in the human body are between 1 micrometer (ÃŽ ¼m) and 100 ÃŽ ¼m in diameter. However, some cells, such as red blood cells (erythrocytes) or the human oocyte, can theoretically be observed directly as they are larger in size. CELL CLASSIFICATION Human adults have hundreds of different cell types in their body. A quick search on Wikipedia resulted in a long list of more than 100 types of cells. They are classifed in three broad categories: 1. Cells that are derived primarily from endoderm 2. 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